HSBC Online Banking Security Flaw Analyzed

greenechidna writes "The BBC is reporting that a vulnerability has been found in the online banking service of HSBC by researchers at Cardiff University. According to the story the attack would allow an attacker to log on to an account within 9 attempts. The attack relies on a keylogger being installed on the victim's machine. The article doesn't have any further technical details." David Nicholson adds links to coverage at CNN and at the Guardian, writing "The attack revolves around the order that customers are requested to enter random security numbers on the site. The main news stories fail to detail the vulnerability but I have provided an analysis of it here."

Comments

Nine attempts?

[Kerr]

As a HSBC internet banking user, I can safely say you'd be locked out long before your ninth attempt, hell; four locked me out when I last forgot my IB code. Being locked out is something you can only fix by visiting your local branch and using your password to unlock the account again.
The number of attempts is not given, but the automatic lockout is at least covered at their security page
Sorry Cardiff University, no bank hax for you today.

Re:Nine attempts?

[BabyDave]

I think it means that after the victim has had 9 successful logins, the h4x0r has enough info to successfully login themselves.

Re:Nine attempts?

[LiquidCoooled]

This is not a problem of trying 9 times to break in, this is a problem of somebody RECORDING whilst you enter your correct details into the account.

As you know, with HSBC, you are asked to specify 3 digits from your security key (which is 6-8 characters long)

This is fine and stops people shoulder surfing to get it once, but if someone keeps recording you they will have all they need.

I actually had more of a shock in the past when I managed to man in the middle the HSBC login, but after speaking to them (they called me back literally within seconds of me mailing them) it was cleared up and my worries were put to rest (there is a ~2 minute timeout where if you steal the cookies from someones machine who has logged in but not logged out where you can technically get at the information - this might have changed since, but it used to be the case)

Re:Nine attempts?

[SatanicPuppy]

It relies on a fricking keylogger. If anything, this is a validation of two factor authentication...It'd be after one attempt with a regular password system.

Why pick on HSBC?

[Anonymous Coward]

So IF my computer has a keylogger and IF my logins are recorded as few as 9 times, THEN the dishonest individual has my security code and can access my account. Whereas, at another bank which asks for a username and passcode, the dishonest individual with the keylogger only needs me to log in ONCE to have the run of my account. So why is this news?

uhhh...

[nFriedly]

The attack relies on a keylogger being installed on the victim's machine.

Uhm.. yea. That attack will get you into about any bank website.. ever.

Keylogger required

[aminal]

So if i have a keylogger on my machine and i log into my online bank, it will log the details i put in and comprimise my online banking?

no shit sherlock.

Re:Keylogger required

[z0idberg]

The point isn't that a keylogger can capture your password. It's that they have tryed to implement a method of entering your 6 digit pin in a way that would stop a keylogger from revealing it, but the way they have done it actually allows a keylogger to figure it after relatively few times of logging in, hence creating a false sense of security.

The PIN is 6 digits, they ask for three of these six digits at any one login (e.g. type the 1st, 3rd and 4th digits of your pin). Because they always ask in ascending order (i.e. never 4th, 2nd and 1st) then after 9 login events the keylogger can figure out the number. All they had to do (and all they have to do now) is ask for the digits in any order and this problem goes away. The keylogger would eventually know which numbers are in your 6 digit pin but never what order, and as there is a 3 (or 4 ?) tries lockout then they wont be able to get in unless they are very lucky guessers.

I have HSBC internet banking and it never actually dawned on me how obvious this problem is, I don't think I ever noticed that they only ever ask in ascending order, but thats the beauty of it I guess.

The majority of online systems

[Timesprout]

will be 'flawed' if you get a keylogger on my pc since the majority rely on me supposedly knowing something you dont, until the logger records it for you that is.

Re:The majority of online systems

[Rob T Firefly]

Safe words, rings, and chains.. is this HSBC or S&M?

A similar problem exists in meatspace

[Bigboote66]

In the U.S., most places have taken to just displaying the last 4 digits of your credit card number on the receipts they give back to you. However, on a recent trip to Europe (Finland & Russia, actually), I noticed that the receipts there seem to favor a scheme where a random set of digits appear each time (e.g. XXXX-XXX1-234X-XXXX). If you're like me, you often accumulate a bunch of these receipts in your pockets as you travel; some people may just dump the days wad of receipts in a trash can. A fortunate dumpster diver may stumble onto a wad of receipts that allow him to reconstruct the credit card number. I'm not sure why the people that implemented that latter scheme thought it was preferable.

-BbT